| Phymatolithon | |
|---|---|
 | |
| Phymatolithon calcareum | |
Scientific classification | |
| Clade: | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Corallinales |
| Family: | Hapalidiaceae |
| Genus: | Phymatolithon Foslie, 1898 |
| Species | |
At least 11, including
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| Synonyms | |
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Phymatolithon is a genus of nongeniculatecoralline red algae, known from the UK,[3] and Australia.[4] It is encrusting, flat, and unbranched; it has tetrasporangia and bisporangia borne in multiporateconceptacles.[3] Some of its cells bear small holes in the middle; this distinctive thallus texture is termed a "Leptophytum-type" thallus surface, and has been posited as a taxonomically informative character.[3] It periodically sloughs off itsepithallus, reducing its overgrowth by algae by as much as 50% compared to bare rock.[5]
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